GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 Sonoma Pickup - 2WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Fog Lights System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Turn the ignition switch to the ON position.
  2. Turn the headlamp switch to HEAD position.
  3. Turn the headlamp dimmer switch to LOW position.
  4. Turn the fog lamp switch to the ON position.
    • Both fog lamps are ON.
    • The fog lamp switch indicator is ON.

Fog Lamps Inoperative - All

2

Turn the headlamp dimmer switch to the HIGH position.
    • The fog lamps are OFF.
    • The fog lamp switch indicator is OFF.

Fog Lamps Always On

3
  1. Place the headlamps in the LOW BEAM position.
  2. Activate the flash to pass function.

The fog lamps turn OFF.

Fog Lamps Always On

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.